Electrical condenser



Aug. 5, 1924. 1,503,553

E. L. POWELL ELECTRICAL CONDENSER Filed Aug. 5, 1922 FIG I 7 85 33 "if f7 a0 6 entor Edwin L. Powell Patented Aug. 5, 192 4.

UNITED STATES EDWIN L. POW'ELL, OF WASHINGTON, DISTRICT OF COLUMBIA.

ELECTRICAL CONDENSER.

Application filed August 5, 1922, Serial No. 579,901.

To all 'whom'z't may concern:

Be it known that I, EDWIN L. PowELL, a citizen of the United States ofAmerica, residing at Washington, .in the District of Columbia, haveinvented certain new and useful Improvements in Electrical Condensers',of which the following is a specification.

My invention relates generally to condensers and more particularly tovariable air condensers.

An object of the invention is the provislon of a condenser in which themain and fine adjustment control knobs are concentrically mountedeconomizing space on a panel board for a dual control of the movableplate assembly of an electric condenser, one directly through themovable plate spindle and one through associated gearing.

' A further object of the invention is to provide a bufi'er eliminatinginjurious jars to the condenser construction upon the limits of rotationof the plate assembly being reached.

With these and other objects in view, the

invention consists in the construction, com-' bination, and arrangementof parts as will be hereinafter described.

Reference is to be had to the accompanying drawings forming part of thisspecific-ation, in which like reference characters indicatecorresponding parts throughout the several views, and in which- Figurelis a sectional view partly broken away of my invention, and

Fig. 2 is a perspective view of the gear housing partly broken away toshow the gear arrangement. 7

Referring more particularly to the drawings, 5 indicates the top of acondenser case in which the usual movable plate assembly l6vand fixedplates 7 are located, the former being attached to a spindle 29. Thisspindle extends through the condenser top and is provided with anenlarged portion 8 having a groove 9 for the recept on of a gearhousing;

The gear housing comprises a top 12, a

bottom 13 provided with a slot 14 andan in ister with graduations on thedial to assist in obtaining proper adjustment of the condenser plates.The bottom 13 is supported in the groove 9 and is held in asubstantially level position. A slot 14 is cut in the bottom of the gearhousing in which a'stud 10 is slidably engaged and which limits themovement of the adjustable plates to an arc of 210 degrees. The stud 10passes through an opening having an enlarged portion 11 and is securedtherein by the screw 15. The opening is somewhat larger in diameter thanthe stud and screw permitting longitudinal adjustment thereof to correctthe meshing as wear on the series of gears requires it. To prevent theends of the slot 14 coming into abrupt contact with the stud uponrotation of the late assembly, I employ a wire 35 wrapped about theshaft and connected at its terminals with the bottom of the gear housingin such a position that it just overlaps the slot forming a buffer, orresilient cushion.

Main adjustment 7 is obtained direct through the spindle 29 whichcarries v,the

operating knob 22 and to which the movable plates are attached, whilefine adjustment is accomplished through a series of gearing,

the prime mover of which is concentrically mounted with respect to themain adjustment unit. A sleeve 23 concentrically mounted about thespindle 29 carries a fine adjustment knob 19 and at its inner end a gear31 which engages with a largerv in sulated gear 32 carried by the stud10. The stud also carries a gear 33 which in turn imparts motion to asecond insulated gear 34 connected in any suitable manner to the spindle29. This series of gearing, which is enclosed in the gear housing, maybe so proportioned as to give any desired ratio of motion. The gear 34is-fixedly connected to the housin and imparts motion from either of thekno s 19 or 22 to the dial 36. That the capacity eifect of thebody maybe reduced to a maximum degree a brush 3 grounds the dial to the panel.

.It is understood that the above description and accompanying drawingsdisclose only the preferred embodiment of my invention and that variousminor changes in de-;

tails of construction, proportion, and arrangement of parts may beresorted to within the scope of the appended; claims and withoutsacrificing any of the advantages of my invention.

Having fully described my invention, what I desire to secure by LettersPatent 1s:

1. A control mechanism including a support, a spindle journaled in saidsupport, means for rotating said spindle in extension thereof, a gearhousing afiixed to said spindle, a train of gears in said housingimparting motion thereto, a second means for rotating said spindlethrough said gearing and housing, and means for limitin the motion ofsaid spindle including a slot in said housing and a stud afiixed to saidsupport and positioned in said slot. I

2. A control mechanism including a support, a spindle journaled in saidsupport, a gear housing aflixed to said spindle, a train of gears insaid housing impartingmotion thereto, means for rotating said spindlethrough said gearing and housing, a slot in said housing, and means foradjustably supporting two of said gears in said train and for limitingthe motion of said spindle consisting of a stud adjustably affixed tosaid support and passing through said slot.

3. A control mechanism including a support, a spindle journaled in saidsupport, means for rotating said spindle, a slotted member aifixed tosaid spindle, means for limiting the rotation of said spindle comprising a stud aflixed to said support and positioned in said slot, andresilient means at the ends of said slot to absorb the shock of motionlimitation. I

EDWIN L. POWELL.

